package com.ecp.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

/**
 * 
 * usage: QRCode.generateQRCode("http://www.pinzhi365.com", 100, 100, "F:\\temp", "test_qr.jpg"); 
 *
 */

public class QRCode {
	private static final int	BLACK	= 0xFF000000;
	private static final int	WHITE	= 0xFFFFFFFF;

	public static boolean generateQRCode(String content, int width, int height, String filePath, String fileName) {
		boolean res = false;
		try {
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			hints.put(EncodeHintType.MARGIN, 0);	// 去除白边

			BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);

			File file = new File(filePath, fileName);
			writeToFile(bitMatrix, "jpg", file);
			res = true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return res;
	}

	public static boolean generateQRCode(String content, int width, int height, OutputStream stream) {
		boolean res = false;
		try {
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			hints.put(EncodeHintType.MARGIN, 0);	// 去除白边

			BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);

			writeToStream(bitMatrix, "jpg", stream);
			res = true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return res;
	}

	public static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}

	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}

	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}

}
